Underfeed stoker



R. B. MILDON 'UNDERPEED sToKER Filed Feb.

Jan. 19, 1932.

21, 1930 2 Sheets-$heet 1 .n .ASM

INVENTOR Regincd Emmen.

QIl l ATTORNEY no. FURNAGES Wm W M Jan. 19, 1932. n. a. MlLnoN 1.842.188

UNDERFBBD STOKER med Feb. 21, 1930 z sheets-sheet 2 .N nur.. l..

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WITNESS Patented Jan. 19, 1932 UNITED STATES PATENT OFFICE REGINALD B.MILDON, F LANSDOWNE, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRICAN'D MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA UNDERFEEDSTOKER Application led February 21, 1930. Serial No. 430,362.

My invention relates to progressive feed stokers, and more particularlyto the multiple retort underfeed t-ype. At the present time,

' all stokers of this type, of which I have knowledge, are soconstructed that the tuyre rows are supported by the retort side walls.

The object of my invention is to support the tuyre rows by meansindependent of the retort side walls, the supporting means being belowthe tuyre rows and not in contactl with the fuel. My inventioncontributes the following advantages to a stoker:

1. Permits relative movement of the parts due to unequal expansion.

2. Facilitates repair and replacement.

3. Localizes trouble in the retort in case the retort walls are burned.

This and other objects are effected by my invention, as will be apparentfrom the following description and claims taken in connection with theaccompanying drawings,

forming a part of this application, in which:

Fig. 1 is a longitudinal sectional view of stolzer apparatus constructedin accordance with my invention, the View being taken on the sectionline I-I of Fig. 2;

Fig. 2 is a fragmentary plan view of the apparatus shown in Fig. 1,certain parts being removed to illust-rate detail construction;

Fig. 3 is an enlarged fragmentary sectional view taken on the lineIII-III of Fig. 1; and,

Fig. 4 is a fragmentary sectional view taken on the line IV-IV of Fig. 1and illustrating the details of the structure at the lower end of thestoker.

According to a preferred embodiment of my invention which is shown onthe accompanying drawings, I provide a multiplerctort underfeed stokerhaving alternatelyarranged retorts and tuyere rows wherein the tuyresare supported by means located between walls of adjacentretorts andindependently of the latter.

Referring now in detail to the construction illustrated, I show, by wayof example, a pair of spaced, parallel I-beams 10 and 11 disposedtransversely beneath the front and rear, respectively, of amultiple-retort underfeed stoker 12. The beams 10 and 11 form the plates20 to the angles 15.

main supporting structure for the stoker. The stoker comprisesalternately-disposed parallel retorts 13 and rows of tuyres 14 andconsist in general of two parts: (l) a steel frame out of contact withthe fuel bed, and (2) a cast iron fuel-supporting grate formed insections and detachably secured to the steel frame.

The steel frame comprises pairs of spaced, parallel angle beam members15 and I-beam members 16 parallel to the beams 15 and so arranged thatone of the I-beam members 16 is disposed between adjacent pairs of anglebeam members 15. The beam members 15 and 16 are secured at their frontand rear to castings 17 and 18, respectively, which latter are supportedby the I-beams 10 and 11.

The length of the castings 17 and 18 determine the width of the retorts.The castings 17 are disposed in abutting side-by-side relation and arebolted to the I-beam 10. The castings 18 are also disposed inside-by-side relation, but are free to slide upon the lower I-beam 11,soas to permit longitudinal expansion of the stoker.

The fuel-supporting surface or combustion grate is formed by the wallsof the retort and the tuyres. These parts are made of cast iron and aresectional so as to resist the heat of the furnace and to permit theready assembly and replacement thereof.

A plurality of upright cast iron plates 20 are bolted to the verticalsides of each angle member 15 and form sectional side walls for theretorts. The ends of adjacent plates 20 forming each side wall aresecured together by clamping plates 21 and bolts 22, the lower ones ofthe bolts 22 serving also to secure the The bottom wall of each of theretorts is formed by plates 23 disposed between the side walls thereof.The bottom walls may be supported directly by the retort side walls.Preferably, however, such bottom walls are supported by cast iron blocks24 which are bolted to the lateral flanges of the pairs of anglemembers.

Supported by the upper face of the I-beams 16 are one or more elongaterectangular castings 25 comprising a bottom plate 26 bolted to the beam16, parallel side pieces 27 and cross pieces 28 connecting the sidepieces to the bottom plate. Tuyres 29 are disposed in overlappingrelation to one another and are supported directly by the side pieces ZTof the rectangular castings :25. The tuyres 29 are provided with lugs 30which engage lugs 31 formed on the inner sides of the side pieces '27.rIhe tuyres are also provided with depending lugs 32. which fit withinslots 3S provided on adjacent tuyres. 'l`he coaeting lugs and 3l, andthe lugs 82 and slots 33 serve to hold the tuyeres in proper assembledrelation.

By reason of the fact that the retort side walls are constructed inseveral sections and are bolted to a supporting frame structure, and thetuyeres' are carried by separate and independent supporting framestructures, all of the parts exposed to the fire are permitted to expandand contract relative to one another. Also by reason of thisconstruct-ion, the retort side and bottom walls may be removed withoutdisturbing the rows of tuyeres. This latter is especially advantageousfrom the viewpoint of maintenance for the reason that in the prior artconstruction, it was necessary to remove the tuyres before removing theretort side wall.

While I have shown my invention in but one form, it will be obvious tothose skilled in the art that it is not so limited, but is susceptibleof various changes and modifications without departing from the spiritthereof, and I, therefore, desire that only such limitations shall beplaced thereupon as are imposed by the prior art or as are specificallyset forth in the appended claims.

lVhat I claim is:

l. In a stoker formed of parallel and alternately-disposed rows oftuyresand retorts, the combinationbi:r a supporting means; plates secured tothe supporting means to form retort side walls; a second supportingmeans; and tuyres bridging the distance between the side walls ofadjacent retorts and supported solely by said second supporting means.

2. In a stoker formed of parallel and alternately-disposed rows oftuyeres and retorts. the combination of a supporting structure arrangedout of contact with the fuel: plates secured to tbe supporting structureand forming sectional side walls of the retorts; a second supportingstructure also arranged out of direct contact with the fuel: tuveresbridging the distance between the side walls of adjacent retorts andsupported solely by said second supporting structure.

3. In a furnace, the combination of a supporting structure disposedtransversely of the furnace and adjacent one wall thereof; a secondsupporting structure disposed in spaced, parallel relation to the firstsupporting structure and at a lower level; and a downwardly-inclinedmultiple-retort underfeed stoker carried by the two supportingstructureswan'd" comprising a plurality of pairs of spaced,substantially parallel beam members carried by the two supportingstructures, other beam members parallel to the pairs of beam members andalso carried by the supporting structures and arranged so that at leastone of said other beam members is disposed between adjacent pairs of thelirst-named beam members, a plurality of upright plates detachablysecured to each of the first-named beam members to form sectional retortside walls, means disposed between alternate adjacentretort side wallsand providing bottoms for the retorts, and tuyre structures bridging theentire space between the side walls of adjacent retorts and supportedsolely by said other beam members whereby the side walls of the retortsmay be inserted and removed without disturbing the tuyre structures.

4. In a Stoker, the combination of a first supporting structure, uprightplates carried by said supporting structure to form parallel spacedret-ort side walls, bottom forming members disposed between alternateadjacent pairs of retort side walls, a second supporting structure, anda series of tuyre plates bridging the space between each of theremaining pairs of retort side walls and carried entirely by said secondsupporting structure, whereby the retort side wall may be removedwithout disturbing the tnyres.

5. In a stoker, the combination of a stationary iirst supportingstructure, upright plates detachably secured to said structure to formstationary, parallel, and spaced retort side walls, bottom formingmembers disposed between alternate adjacent pairs of retort side walls,a second stationary supporting struc-` ture, and a series of tuyreplates bridging the space between each of the remaining pairs of retortside walls and detaehably secured and supported entirely by said secondsupporting structure, whereby the retort side walls may be removedwithout disturbing the tuyres.

In testimony whereof, I have hereunto subscribed my name this 17th dayof Feb.,

REGINALD B. MILDON.

